adj. 准确的;严密的;精密的,精确的;
vt. 要求;苛求;迫使;强求;
例句:
It is impracticable for some parents to exact obedience of their children.
有些父母强令其子女服从是不现实的.
The editor at once sent the journalist a telegram instructing him to find out the exact number of steps and the height of the wall.
编辑立即给这位记者发了一份电报,叫他查明台阶的准确数目以及围墙的高度.
His answer is quite exact.
他的回答完全正确.